L6598 is a high voltage resonant controller manufactured by STMicroelectronics with voltage ratings up to 600V, driver current capability of 250mA source, 450mA sink, switching times of 80/40ns rise/fall with 1nF load, CMOS shutdown input, undervoltage lockout, soft-start frequency shifting timing, sense op amp for closed loop control or protection features, high accuracy current controlled oscillator, integrated bootstrap diode and clamping on Vs.